Why did west virginia break away from the rest of virginia?

West Virginia broke away from the rest of Virginia because West Virginia began the Secessionist Convention. It was a key Civil War border state.

the great wall of china worked as a defense for the feudal states of the zhou dynasty to the north. during the warring states period more walls were put up to defend the borders of the different kingdoms. it was semi successful because despite the wall, the mongols eventually conquered china also the great wall provided protection to the economic development and cultural progress, safeguarded the trading routes such as the silk road, and secured transmission of information and transportation. @jayxboof